[Boatanchors] B&W 376 Coax Switch

[Bry Carling]

Diesel fuel. Interesting.. I would have recommended penetrating oil such as "Liquid Wrench."

On 17 Dec 2012 at 8:08, David C. Hallam wrote:

> 
> Thanks for the information and pictures.  The 376 is a little
> different 
> in that the SO-239 connecters are mounted radially around the side
> of 
> the can but probably the same basic construction.  Right now the
> switch 
> is sitting in a small container of diesel fuel immersed up to the
> level 
> of what I think is the switch detent but not the coax connectors. 
> With 
> the increased leverage of a small Crescent wrench, the shaft will
> turn 
> without too much effort.  I can feel when it hits one of the
> detents.
> 
> I will let it soak for a few more days and see what happens.  If the
> switch will not turn in an acceptable manner with the knob on the 
> switch, I will cut the back of the can off to work on it.
> 
> 73
> David
> KW4DH
> 
> On 12/17/2012 12:41 AM, Marshall Dues (K5MMD) wrote:
> > Hi, David,
> >
> > I found a B&W model 375 6 position coax switch at a Texas hamfest
> a 
> > few years ago that also had a frozen switch shaft.  That 'splains
> why 
> > it only cost me a dollar.  I tried the same thing as you by
> putting 
> > Mobil-1 synthetic motor oil on the shaft with the same failed
> result.
> > So, I simply used a can opener and cut around the SO-239 panel end
> > like a can of soup to open it up and was able to disassemble this
> > rather well built switch.  I then used the same Mobil-1 oil on the
> > other end of the switch shaft as well as the captive detent ball
> > bearing and its holder.  I let it soak for an hour then gripped
> the 
> > knob shaft and began rotating it until it turned freely.  This is
> a 
> > quality ceramic switch with solid bus bar conductors that  
> grounds 
> > all coax sockets except for the selected position.  It is
> important to 
> > either resolder the SO-239 end of the can around the edge or
> solder 
> > short lengths of coax cable braid as bonding jumpers to the can 
> > because of the need to restore the ground path to the coax
> connectors 
> > when reassembling the case. My one dollar gamble paid off well for
> me.
> >
> > Pictures attached:
> >
> > regards,
> >
> > Marshall Dues,  K5MMD
> > Katy (Houston area), Texas
> 
> -- 
> A democratic government is the only one in which those who vote for
> a tax can escape the obligation to pay it.
> Alexis de Tocqueville
> 
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